Traction Force how to set

Hi,
I am wondering how to optimally set the traction force, especially with an extender.
We all see that some producer advertise 5 lbs, 10 lbs traction force, but how exactly do we set it?
More focused, I have a classic extender with rods and springs. I have tried several settings and can’t imagine what would be better.
Not having a tension map, I need to add/remove rods for the perfect stretch, but even so I have some headaches.

1. I set the extender to stretch seriously. I put it on, almost gets buried in my fat pad, and I can really feel the stretch. But after maximum 1h30min I need to take it off and have a short break because it gets painful/uncomfortable

2. I remove the smallest rods (about 0.5 inch) and I get a much more comfortable setting. The penis is gently stretched. Very easy to wear for hours. But I don’t have that sensation that it’s forcing it to grow.

*important to note. I only push/use the springs when mounting the device. They get back to normal when the extender is on. Sometimes I feel their presence when I sit/get up from the bed, couch, etc.
Should I set the extender tension as to keep the springs tensed all of the time?

I don’t know how should I know what amount of pressure to put. It’s not growing either way (but I have not given it enough time)
How would you set it for best results?

I prefer to keep the spring about half to 2/3 compressed so the base doesn’t dig too hard into the fat pad. This setting is more comfortable than at max compression while allows the spring to stretch the shaft. Too tensed spring shortens wearing time and defeats the purpose of the extender.